DbHelper数据操作类

using  System;
using  System.Data;
using  System.Data.Common;
using  System.Configuration;
public  class  DbHelper
{
     private  static  string  dbProviderName = ConfigurationManager.AppSettings[ " DbHelperProvider " ];
     private  static  string  dbConnectionString = ConfigurationManager.AppSettings[ " DbHelperConnectionString " ];
     private  DbConnection connection;
     public  DbHelper()
    {
         this .connection = CreateConnection(DbHelper.dbConnectionString);
    }
     public  DbHelper( string  connectionString)
    {
         this .connection = CreateConnection(connectionString);
    }
     public  static  DbConnection CreateConnection()
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbConnection dbconn = dbfactory.CreateConnection();
        dbconn.ConnectionString = DbHelper.dbConnectionString;
         return  dbconn;
    }
     public  static  DbConnection CreateConnection( string  connectionString)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbConnection dbconn = dbfactory.CreateConnection();
        dbconn.ConnectionString = connectionString;
         return  dbconn;
    }
     public  DbCommand GetStoredProcCommond( string  storedProcedure)
    {
        DbCommand dbCommand = connection.CreateCommand();
        dbCommand.CommandText = storedProcedure;
        dbCommand.CommandType = CommandType.StoredProcedure;
         return  dbCommand;
    }
     public  DbCommand GetSqlStringCommond( string  sqlQuery)
    {
        DbCommand dbCommand = connection.CreateCommand();
        dbCommand.CommandText = sqlQuery;
        dbCommand.CommandType = CommandType.Text;
         return  dbCommand;
    }

     #region  增加参数
     public  void  AddParameterCollection(DbCommand cmd, DbParameterCollection dbParameterCollection)
    {
         foreach  (DbParameter dbParameter  in  dbParameterCollection)
        {
            cmd.Parameters.Add(dbParameter);
        }
    }
     public  void  AddOutParameter(DbCommand cmd,  string  parameterName, DbType dbType,  int  size)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Size = size;
        dbParameter.Direction = ParameterDirection.Output;
        cmd.Parameters.Add(dbParameter);
    }
     public  void  AddInParameter(DbCommand cmd,  string  parameterName, DbType dbType,  object  value)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Value = value;
        dbParameter.Direction = ParameterDirection.Input;
        cmd.Parameters.Add(dbParameter);
    }
     public  void  AddReturnParameter(DbCommand cmd,  string  parameterName, DbType dbType)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Direction = ParameterDirection.ReturnValue;
        cmd.Parameters.Add(dbParameter);
    }
     public  DbParameter GetParameter(DbCommand cmd,  string  parameterName)
    {
         return  cmd.Parameters[parameterName];
    }

     #endregion

     #region  执行
     public  DataSet ExecuteDataSet(DbCommand cmd)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataSet ds =  new  DataSet();
        dbDataAdapter.Fill(ds);
         return  ds;
    }
     public  DataTable ExecuteDataTable(DbCommand cmd)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataTable dataTable =  new  DataTable();
        dbDataAdapter.Fill(dataTable);
         return  dataTable;
    }
     public  DbDataReader ExecuteReader(DbCommand cmd)
    {
        cmd.Connection.Open();
        DbDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);            
         return  reader;
    }
     public  int  ExecuteNonQuery(DbCommand cmd)
    {
        cmd.Connection.Open();
         int  ret = cmd.ExecuteNonQuery();
        cmd.Connection.Close();
         return  ret;
    }
     public  object  ExecuteScalar(DbCommand cmd)
    {
        cmd.Connection.Open();
         object  ret = cmd.ExecuteScalar();
        cmd.Connection.Close();
         return  ret;
    }
     #endregion

     #region  执行事务
     public  DataSet ExecuteDataSet(DbCommand cmd,Trans t)
    {
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataSet ds =  new  DataSet();
        dbDataAdapter.Fill(ds);
         return  ds;
    }
     public  DataTable ExecuteDataTable(DbCommand cmd, Trans t)
    {
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataTable dataTable =  new  DataTable();
        dbDataAdapter.Fill(dataTable);
         return  dataTable;
    }
     public  DbDataReader ExecuteReader(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbDataReader reader = cmd.ExecuteReader();
        DataTable dt =  new  DataTable();
         return  reader;
    }
     public  int  ExecuteNonQuery(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
         int  ret = cmd.ExecuteNonQuery();
         return  ret;
    }
     public  object  ExecuteScalar(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
         object  ret = cmd.ExecuteScalar();
         return  ret;
    }
     #endregion
}

public  class  Trans : IDisposable
{
     private  DbConnection conn;
     private  DbTransaction dbTrans;
     public  DbConnection DbConnection
    {
         get  {  return  this .conn; }
    }
     public  DbTransaction DbTrans
    {
         get  {  return  this .dbTrans; }
    }

     public  Trans()
    {
        conn = DbHelper.CreateConnection();
        conn.Open();
        dbTrans = conn.BeginTransaction();
    }
     public  Trans( string  connectionString)
    {
        conn = DbHelper.CreateConnection(connectionString);
        conn.Open();
        dbTrans = conn.BeginTransaction();
    }
     public  void  Commit()
    {
        dbTrans.Commit();
         this .Colse();
    }

     public  void  RollBack()
    {
        dbTrans.Rollback();
         this .Colse();
    }

     public  void  Dispose()
    {
         this .Colse();
    }

     public  void  Colse()
    {
         if  (conn.State == System.Data.ConnectionState.Open)
        {
            conn.Close();
        }
    }
}

1、直接执行sql语句

DbHelper db =  new  DbHelper();
DbCommand cmd = db.GetSqlStringCommond( " insert t1 (id)values('haha') " );
db.ExecuteNonQuery(cmd); 

2、执行存储过程

DbHelper db =  new  DbHelper();
DbCommand cmd = db.GetStoredProcCommond( " t1_insert " );
db.AddInParameter(cmd,  " @id " , DbType.String,  " heihei " );
db.ExecuteNonQuery(cmd); 

3、返回DataSet

DbHelper db = new DbHelper();

DbCommand cmd = db.GetSqlStringCommond( " select * from t1 " );

DataSet ds = db.ExecuteDataSet(cmd);  

4、返回DataTable

DbHelper db = new DbHelper();

DbCommand cmd = db.GetSqlStringCommond("t1_findall");

DataTable dt = db.ExecuteDataTable(cmd); 

5、输入参数、输出参数、返回值

DbHelper db =  new  DbHelper();
DbCommand cmd = db.GetStoredProcCommond( " t2_insert " );
db.AddInParameter(cmd,  " @timeticks " , DbType.Int64, DateTime.Now.Ticks);
db.AddOutParameter(cmd,  " @outString " , DbType.String,  20 );
db.AddReturnParameter(cmd,  " @returnValue " , DbType.Int32);
db.ExecuteNonQuery(cmd);
string  s = db.GetParameter(cmd,  " @outString " ).Value  as  string ; // out parameter
int  r = Convert.ToInt32(db.GetParameter(cmd,  " @returnValue " ).Value); // return value 

6、DataReader使用

DbHelper db =  new  DbHelper();
DbCommand cmd = db.GetStoredProcCommond( " t2_insert " );
db.AddInParameter(cmd,  " @timeticks " , DbType.Int64, DateTime.Now.Ticks);
db.AddOutParameter(cmd,  " @outString " , DbType.String,  20 );
db.AddReturnParameter(cmd,  " @returnValue " , DbType.Int32);
using  (DbDataReader reader = db.ExecuteReader(cmd))
{
    dt.Load(reader);
}        
string  s = db.GetParameter(cmd,  " @outString " ).Value  as  string ; // out parameter

int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);//return value 

7、事务使用

pubic  void  DoBusiness()
{
     using  (Trans t =  new  Trans())
    {
         try
        {
            D1(t);
             throw  new  Exception(); // 如果有异常,会回滚滴
            D2(t);
            t.Commit();
        }
         catch
        {
            t.RollBack();
        }
    }
}
public  void  D1(Trans t)
{
    DbHelper db =  new  DbHelper();
    DbCommand cmd = db.GetStoredProcCommond( " t2_insert " );
    db.AddInParameter(cmd,  " @timeticks " , DbType.Int64, DateTime.Now.Ticks);
    db.AddOutParameter(cmd,  " @outString " , DbType.String,  20 );
    db.AddReturnParameter(cmd,  " @returnValue " , DbType.Int32);
     if  (t ==  null ) db.ExecuteNonQuery(cmd);
     else  db.ExecuteNonQuery(cmd,t);
     string  s = db.GetParameter(cmd,  " @outString " ).Value  as  string ; // out parameter
     int  r = Convert.ToInt32(db.GetParameter(cmd,  " @returnValue " ).Value); // return value
}
public  void  D2(Trans t)
{
    DbHelper db =  new  DbHelper();
    DbCommand cmd = db.GetSqlStringCommond( " insert t1 (id)values('..') " );
     if  (t ==  null ) db.ExecuteNonQuery(cmd);
     else  db.ExecuteNonQuery(cmd, t);

} 

数据库连接字符串：

< appSettings >
     < add  key ="DbHelperProvider"  value ="System.Data.SqlClient" />
     < add  key ="DbHelperConnectionString"  value ="Data Source=(local);Initial Catalog=DbHelperTest;Persist Security Info=True;User ID=sa;Password=sa" />
</ appSettings > 

转载：http://www.cnblogs.com/fanrong/archive/2007/04/25/726526.html